Regular Expressions 101

^start of line

Positive Lookahead(?=[^#@*]*[#@*][^#@*]*$)

Negated Character Class[^#@*]*

*matches any number of characters outside the set below:

#the literal # (35₁₀ / 43₈ / 23₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

Character Class[#@*]

#the literal # (35₁₀ / 43₈ / 23₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

Negated Character Class[^#@*]*

*matches any number of characters outside the set below:

#the literal # (35₁₀ / 43₈ / 23₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

$end of line

Group 1([A-Z][\d])

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

Character Class[\d]

\da digit

Group 2([A-Za-z0-9#@*]+)

Character Class[A-Za-z0-9#@*]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

#the literal # (35₁₀ / 43₈ / 23₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 3([\d]{3})

Character Class[\d]{3}

{3}matches exactly 3 characters from the set below:

\da digit

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?=[^#@*]*[#@*][^#@*]*$)([A-Z][\d])([A-Za-z0-9#@*]+)([\d]{3})$

New

A4#Fgf344
A4Fg#f344